Clock



FIG. 1 is a front elevational view of a clock showing my new design;

FIG. 2 is a right-side elevational view thereof, the left-side elevational view being a mirror image thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a vertical sectional view taken generally on the line 5--5 of FIG. 1. 

The ornamental design for a clock, as shown and described. 